Condenser



. .20 when operating the set.

Patented Dec. 21, 1926.

wILrRIn LATRAVERSE, or MONTREAL, QUEBEC, CANADA.

CONDENSER.

Application filed December 24, 1925. Serial No. 77,566.

This invention relates to new and useful improvements in radio equipment particularly to the condensers and the object of v the invention is to provide a device which will allow the operator of such equipment to make very fine adjustments in the condensers so that more selective reception may be obtained in a receiving set.

Another object is to provide a device of .the class stated which will be simple and easy to operate and also will allow for the marking of the various stations by providing an operating mechanism for thescondensers capable of a rotary movement of one complete revolution or 360.

. Another object is to provide condensers which may be easily adjusted to suit conditions. in the equipment and when once setno further adjustment will be necessary A further object is to provide a well balancedset of condensers which will be operated from a common source;

In my inventiom J provide a battery of condensers coupled together and insulated 'from one another and operated from a common. source by means of gearing or the like transmission meansflwhich will allow the operating handle to move 'through one complete revolution to allow for easy ad I justments to bemade ,in the positioning of [the movable blades with regardto the fixed plates of the condenser. Means are also provided in. each condenser for adjusting .same to suit requirements of the operator. Inthe drawings which illustrate one form of myinvention; r p Figure l is a front elevation of my improved condenser. Figure-2 is a plan view of the device shown in Eigure 1 with three condensers operated from a common source.

Figure 3 is a diagrammatic illustration of one way of connecting the condensers in series. y/ Figure 4 is a diagrammatic illustration of a radio receiving circuit showing the condensers which may be operated from a I common source. 1 Referring more particularly to the drawings, 11, 12 and 13 designate three separate variable condensers which may be mounted in a ra-diolreceiving set... Each condenser comprises end plates 14 and equally spaced fixed plates 15 which are of substantially 2 semi c1rcular formation and are held in provided with apertures 24* surroun place by means of the bolts 16 passing through the end plates. Spacers 17may be placed between each of the plates to hold them apart, said spacers being: made of micamite or such like insulating washersf Each condenser is provided with a spindle. l8upon which are mounted the movable plates 19, spacers 20 being placed between them .to hold them apart. Themovable 5 plates are also of substantially semi-circular formation. .By moving the spindle, the movable group of plates may be moved into closer relationship or away from the fixed plates, each movable plate entering into or receding from its corresponding air space, between one pair of fixed plates, whereby the magnitude of the electro-static capacity between said plates may be varied. The maximum capacity of such types of condensers depends upon the area, the total number of and the separation of the plates. The foregoin is descriptive of the common type ofcon enser at present usedin the majority of radio receiving sets at present 30 in use and the number of plates shown ma be varied according to the capacity require The spindles 18 in my improved type of condensers are so made that. they extend beyond the end plates to form 9a means 35 of coupling the shafts together. Couplings 21 may be placed between the adjacent ends of the spindles of adjacent condensers and 5 'may comprise cylindrical insulating members having recesses 22 formed 1n each end 0 to receive the ends of the spindles and keys 22 ;or such like means may be. used to secure them to the coulings or in the recesses. Insulating fixe spacers 24 may be provided between adjacent end plates of the condensers and said spacers may be ding the couplings to allow them to rotate freely therein. The condensers are mountedin any suitable manner on the ipanel 25". A toothed wheel 27 is secured to the end 26 of the spindle adjacent the panel. Gearing with the toothed wheel is the toothed pinion 28 which issecured to a spindle 29 retatably mounted in suitable bearings formed in or secured to the panel. Thisspindle 29 extends outwardly from the face of the panel and secured to the end of the spindle is the operating handle 30," which is provided with an indicator disc 31 which may be marked in; any suitable manner to assist the operator in positioning the movable plates in any desired position to receive messages of any known wave lengths. In the drawing the markings are shown ex'-. tendin from 200 to 600 metres but this may 6 be mo ifiedand letters or names indicating the various stations maybe used instead of figures or numerals shown. The condensers are in alignment as shown and are coupled together to move in unison. Additional 10 plates which may be called balancing plates 32 may be used in each condenser to provide an easy means of adjustment for regulating the condensers when securing theme in position, These plates 32 are somewhat 16 smaller than the movable plates and are shown in the form of a quadrant, but the shape of same may be altered if so desired. The plates 32 are movable in the vertical direction and two such plates may 50 be mounted in each condenser in the manner hereinafter described. Secured to the bolts for supporting the fixed plates are the brackets 33 and rotatably mounted in: said brackets are the "adjusting screws 34. Formed in the edges of the plates are the bosses 35 which may be threaded to receive the threads of the bolts which may be provided with suitable means such as the collars 36 'to prevent longitudinal movement of the bolts within the bearing 'or brackets 33. the small plates to be moved in the vertical direction so that same may be adjusted to suit the required maximum capacity of- 35 each condenser.

In Figure 3 the condensers are wired u in series between the grid of the valve and an other part of a the radio equipment w ich may be mounted in the set and 40 is only illustrative of one of the uses to which my improvement may be applied. In Figure 4 a wiring diagram of'a radio receiving set is shown in which four valves- V are shown, and fivefcon'densers C are '45 used. f It will be noticed from this diagram that one of the smaller plates orbalanci'ng plates X of each condenseryis connected to the plate side of the lamp and the other balancin plate ta ped into the wire 0011-- Q nec ingt e rotor side of the condenser, All 0t er parts of the set are wired or connected together to the batteries, coils etc inthe; manner" shown. The'type "of wiring and thenumber of condensers. may he ;varied-'-' 'and'the'manner of connectingu the com .densers in the set may be mod fied without departingfrom the. spirit or the int-en rtion. The condensers'G are 0 er'ated' from a common source which is shown diagraming in of any desired station. and the dial This construction allows p prising w an ad usting screw slidably mounted in the" .J y a In: witness whereof, Iflhavc matically 'by means of the, dotted line Z and the operating handle Y, so that whenthe handle Y is rotated all the movable plates in the condensers may be moved, in unison? The smaller plates are adjusted by mowing the adjusting screws to raise or lower the said lates to suit the required capacity of eacli condenser and when set no more adjustments of the smaller plates are required. It will be readil understood that when condensers are coup ed up in the manner herein disclosed that once their maximum desired. capacity isset by moving j the smaller plates, the battery of condensers may be moved in unison'to control thetum may be Lmarked toallow for quick and 7 easy adjustment of the position of the condenser plates to suit, the desired wave len th. Many types of radio receiving or tra mitting sets ,using such types, of variable condensers may be coupled up together in the manner shown to move in unison "to I facilitate operation of the set in which they aremounted.' 1

Having thus .described my invention, what I claim is;

1. In radio equipment, 'va'rEabIe plate condensers comprising end plates, a plurality of spaced fixed plates secured to bolts assmg throughsaid end plates and'means lnsulating and spacing the fixed plates from one another, a spindle passing through the end plates, a plurality of movable platessecured to and adapted to rotate 'with the spindle, each movable plate being'positioned to pass midway between a pair of fixed plates, balancing plates adjustably secured to the condensers and in proximity to oneof v the fixed; plates, said balancing plates being movable in. a vertical plane and parenema. the fixed plates, ancha device for moving each i said balancing plates coma bra et securedto the condensers,

bracket and secured to the balancing plates and means to move the plates in the'longitudinal direction of the adjusting screws.

'2. A variable plate condenser including balancing plates, a device for moving each balancing plateQcomprising a bracket secured to the condenser, an adjusting screw slidabl g mounted in the bracket and secured-to the balancing plates and means to mev the plates'in the longitudinal direcs tion,-;of the adjusting screw.-

t m hereunto set my hand. a v

WILFRID LATR'AVERSE. 

